Ultra-large Indirect Air-cooled Structure System Temperature Stress Analysis And Study

In China the development of air-cooled technology of power plants has come through from small to large,from juvenility to relative maturity,and the application of indirect air-cooled technology has made a significant progress in power plants.However, with the emergence of air-cooled large units,the height of some air-cooled towers has exceeded the scope of application of conventional cooling tower in 'fuel electric plants hydraulic design specifications',so there are many difficult problems to be solved.The air-cooled tower whose height exceeds 165 meter is called ultra-large air-cooled tower. The main control loads include earthquake load self-loading temperature load.This paper,staring from temperature load,does some analysis and exploring on the ultra-large air-cooled tower and provides some reference for the design of the ultra-large air-cooled tower.This paper chooses the proposed ultra-large indirect air-cooled tower of coal power plant for the study object.This paper detailedly analyze the temperature field under various temperature effects,mainly including season temperature,sudden temperature, sunlight temperature change,technics temperature and so on.The analysis of solar radiation,using the method of outdoor integrated converted temperature,and considering the solar illumination,the average outdoor temperature,outdoor wind speed, material property and other factors and figuring out the straight solarization surface temperature of the tower,and assuming that the straight solarization surface temperature of tower is the cosine distribution.This paper introduces reference temperature,and take the final setting temperature of concrete as the reference temperature.The temperature change of tower is based on the reference temperature,which is more in the line with the actual situation. This paper,using the finite element software ANSYS,analyzes the temperature stress of ultra-large indirect air-cooled tower under every temperate case,and contrasts them with the gravitation.From comparison finding that the reaction force of the column toe under the temperature effect is less than one-tenth of that under the gravitation.The impact of the temperature on the tower is mainly in the ring,and the greatest tensile stress of the annulus exceeds the tensile strength design value of the concrete.A disadvantage temperature distribution on the tower is the temperature difference between the outside and inside of the tower,and the temperature stress augments with the augmentation of the temperature difference.